Earlier quoted context omitted.
> Not eating and getting low blood sugar can much more simply answer the question of "Do I have free will, or am I a subject of my internal chemical reactions". You cannot control what you feel, but you can control your actions.
> You cannot control what you feel, but you can control your actions. I'll respond in a way that I hope is clear and relatively objective. This will take the form of an "if-then" claim nested within another "if-then" claim. IF a person (1) accepts philosophical materialism, but (2) remains agnostic as to quantum effects at macro scale THEN then the following response follows logically: It depends what you mean by "yo…
That sort of punts on the question of physical determinism, where it doesn't matter if it was possible for you to have done anything other than what you did. You could be a pure clock work automaton making deterministic responses to external stimuli and still have that sort of "free will", but I don't think that would be satisfying to a lot of people.
The second kind of free will, I think would be the ability to have a free choice -- that there is some immaterial entity which can act in somehow a non-deterministic way to choose its behavior, that the course of your entire life wasn't set at the big bang -- that not only can you act independently, but that your choices _matter_ and will result in a future that was not predetermined. I think that is what a lot of people would think of as free will, and it's difficult to define or logically support IMO.